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potassium nitrate
(Encyclopedia) potassium nitrate, chemical compound, KNO3, occurring as colorless, prismatic crystals or as a white powder; it is found pure in nature as the mineral saltpeter, or niter. (The name…Labrador retriever
(Encyclopedia) Labrador retriever, breed of large sporting dog whose origins are obscure but whose immediate ancestors were developed in Newfoundland and brought to England in the early 1800s. It…nuclear winter
(Encyclopedia) nuclear winter, theory holding that the smoke and dust produced by a large nuclear war would result in a prolonged period of cold on the earth. The earliest version of the theory,…Marsh test
(Encyclopedia) Marsh test, method for the detection of arsenic, so sensitive that it can be used to detect minute amounts of arsenic in foods (the residue of fruit spray) or in stomach contents. The…castor oil
(Encyclopedia) castor oil, yellowish oil obtained from the seed of the castor bean. The oil content of the seeds varies from about 20% to 50%. After the hulls are removed the seeds are cold-pressed.…Blakeslee, Albert Francis
(Encyclopedia) Blakeslee, Albert Francis, 1874–1954, American botanist, b. Genesee, New York. He received his Ph.D. at Harvard (1904) and was a member of the faculty until 1907. After several years…hydrothermal vent
(Encyclopedia) hydrothermal vent, crack along a rift or ridge in the deep ocean floor that spews out water heated to high temperatures by the magma under the earth's crust. Some vents are in areas of…gelatin
(Encyclopedia) gelatin or animal jelly, foodstuff obtained from connective tissue (found in hoofs, bones, tendons, ligaments, and cartilage) of vertebrate animals by the action of boiling water or…rum
(Encyclopedia) rum, spirituous liquor made from fermented sugarcane products. Prepared by fermentation, distillation, and aging, it is made from the molasses and foam that rise to the top of boiled…Sharp, Phillip Allen
(Encyclopedia) Sharp, Phillip Allen, 1944–, American geneticist, b. Falmouth, Ky., Ph.D., Univ. of Illinois, 1969. Sharp joined the faculty at the Massachusetts Institute of Technology in 1974, where…Trending
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